JPS6159563B2 - - Google Patents
Info
- Publication number
- JPS6159563B2 JPS6159563B2 JP6359380A JP6359380A JPS6159563B2 JP S6159563 B2 JPS6159563 B2 JP S6159563B2 JP 6359380 A JP6359380 A JP 6359380A JP 6359380 A JP6359380 A JP 6359380A JP S6159563 B2 JPS6159563 B2 JP S6159563B2
- Authority
- JP
- Japan
- Prior art keywords
- antenna
- vehicle body
- vhf
- antennas
- impedance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000010586 diagram Methods 0.000 description 8
- 239000003990 capacitor Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000005404 monopole Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0802—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection
- H04B7/0805—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with single receiver and antenna switching
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Details Of Aerials (AREA)
- Support Of Aerials (AREA)
- Radio Transmission System (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
Description
【発明の詳細な説明】
本発明は自動車塔載用テレビ受信アンテナ装置
に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a television receiving antenna device mounted on an automobile tower.
この種のアンテナ装置としては、フラツターに
よる画像の乱れが少ないこと、小型・軽量で、か
つ自動車に取り付けやすく簡単なエレメント構成
であること、また自動車はかなりの速度で走行す
るため風圧に関しても充分考慮する必要がある
が、さらにアンテナを取付ける位置が人の顔ぐら
いの高さになるため安全性についても同様に充分
考慮したデザインにしなければならない等の条件
を備えていなければならない。 This type of antenna device has the following features: it has minimal image disturbance due to flutter, it is small and lightweight, and it has a simple element configuration that is easy to attach to a car.Also, since cars travel at considerable speed, sufficient consideration must be given to wind pressure. In addition, the antenna must be installed at a height that is about the same as a person's face, so the design must also take safety into account.
特に第１のフラツター現像について、まずその
生じる原因を考察してみると、これは直接波が地
形や建造物、送電線などにより生じる反射波や遮
蔽によつて乱され、一方、アンテナの地上からの
高さが１ｍ前後であることにより電界強度の激し
い変動を直接受けるためである。加えて、自動車
が高速で走行するため、上記した現象に対してさ
らに条件が悪くなるものであつた。 In particular, if we first consider the cause of the first flutter development, it is because direct waves are disturbed by reflected waves and shielding caused by terrain, buildings, power transmission lines, etc. This is because the height of the tube is around 1 m, so it is directly exposed to severe fluctuations in electric field strength. In addition, since automobiles travel at high speeds, the conditions for the above-mentioned phenomenon are even worse.
この現像を軽減するためには、アンテナとして
その特性が単指向性で、かつ感度の高いものが要
求される。しかるに、自動車は電波到来方向に対
して、常に任意の方向に移動するものであるた
め、単指向性アンテナであつてもそのメインロブ
方向が必ずしも電波到来方向に一致するとは限ら
ない。また、特に乗用車では前記したように小
型・軽量で、かつ簡単なエレメント構成で取付簡
易、さらに風圧、安定性も考慮しなければならな
い等、多数の制約があり、これらの条件を全て満
すことは困難である。 In order to reduce this development, an antenna with unidirectional characteristics and high sensitivity is required. However, since a car always moves in an arbitrary direction with respect to the direction of arrival of radio waves, even if it is a unidirectional antenna, its main lobe direction does not necessarily coincide with the direction of arrival of radio waves. In addition, as mentioned above, especially in passenger cars, there are many constraints such as being small and lightweight, having a simple element configuration and being easy to install, and also considering wind pressure and stability, and it is necessary to satisfy all of these conditions. It is difficult.
本発明は上記点に鑑みなされたもので、同一筐
体に構成した個別に動作する２種類のアンテナを
２基、車体に設置することにより、電波到来方向
に対して自動車がいかなる方向に位置してもフラ
ツター現象を大幅に改善できる自動車塔載テレビ
用受信アンテナ装置を提供しようとするものであ
る。 The present invention was made in view of the above points, and by installing two types of antennas that operate independently and configured in the same housing on the vehicle body, it is possible to locate the vehicle in any direction with respect to the direction in which radio waves arrive. The object of the present invention is to provide a receiving antenna device for an automobile tower-mounted television, which can significantly improve the flutter phenomenon even when the antenna is mounted on a car tower.
以下本発明について詳細に説明する。まず、本
発明の概要を説明する。本発明では第１図のごと
くアンテナを構成する。このアンテナ１は、車体
を接地板として構成した不平衡給電型アンテナ２
と、車体を反射板として構成した平衡給電型アン
テナ３とから成り立つており、同一筐体１′に構
成されている。このアンテナ１を第２図に示すご
とく、自動車４の左右に取付ける。この時のアン
テナ１の指向性は、第３図Ａ，ａに示すように平
衡給電型アンテナ３は単指向性を有し、一方第３
図Ｂ，ｂに示すように不平衡給電型アンテナ２は
８の字指向性を有する。そして、図示していない
がこれらアンテナ２，３の出力を連続的にレベル
比較し、そのレベルの高い方を自動的にテレビジ
ヨン受像機（図示せず）に切換接続することによ
り、フラツター現象を軽減するようにしている。 The present invention will be explained in detail below. First, an overview of the present invention will be explained. In the present invention, the antenna is configured as shown in FIG. This antenna 1 has an unbalanced feeding type antenna 2 configured with the vehicle body as a ground plate.
and a balanced feeding type antenna 3 configured with the vehicle body as a reflector, and are configured in the same housing 1'. This antenna 1 is attached to the left and right sides of an automobile 4 as shown in FIG. At this time, the directivity of the antenna 1 is as shown in FIG. 3A, a.
As shown in Figures B and b, the unbalanced feeding antenna 2 has a figure-of-eight directivity. Although not shown, the outputs of these antennas 2 and 3 are compared in level continuously, and the one with the higher level is automatically switched and connected to the television receiver (not shown), thereby eliminating the flutter phenomenon. I'm trying to reduce it.
次に本発明の具体的な実施例について説明す
る。まず実現上の問題として、車体を反射板とし
て構成したアンテナ３は車体に近接して平衡配置
されるため不整合損失が大きいということが挙げ
られる。 Next, specific examples of the present invention will be described. First, a practical problem is that the antenna 3, which has the vehicle body as a reflector, is disposed in a balanced manner close to the vehicle body, resulting in large mismatch loss.
第４図に全長1200mmで、２周波動作をさせるた
めに中間ローデイングしたアンテナのインピーダ
ンス特性を示す。この図から明らかなように、そ
のインピーダンスは良くない。したがつてインピ
ーダンス整合をしなければアンテナとして動作さ
せることができない。これはVHFローバンドで
は極めて難しい。しかし、VHFハイバンドにつ
いてはインピーダンス整合が可能となる。 Figure 4 shows the impedance characteristics of an antenna with a total length of 1200 mm and an intermediate loading for dual-frequency operation. As is clear from this figure, its impedance is not good. Therefore, it cannot be operated as an antenna without impedance matching. This is extremely difficult in the VHF low band. However, impedance matching becomes possible for the VHF high band.
第５図にその回路例を示す。アンテナ３の寸法
は全長１ｍで、バランT1を介してイ点よりみた
インピーダンス特性は第６図イのようになり、次
に前記バランT1にコンデンサC1（2pF）とコイ
ルL1（0.26μＨ）の直列共振回路を挿入してその
一端ロからみたインピーダンス特性は第６図ロの
ようになり、さらにコイルL1の一端にトランス
T2を介してコンデンサC2（4pF）を並列に挿入
したその一端ハからみたインピーダンス特性は第
６図ハのようになる。 FIG. 5 shows an example of the circuit. The dimensions of the antenna 3 are 1 m in total length, and the impedance characteristics seen from point A through the balun T 1 are as shown in Figure 6 A. Next, the balun T 1 is connected to a capacitor C 1 (2pF) and a coil L 1 (0.26 When a series resonant circuit (μH) is inserted, the impedance characteristics seen from one end (B) are as shown in Figure 6 (B), and a transformer is connected to one end of the coil L1 .
The impedance characteristic seen from one end (C) of which a capacitor C 2 ( 4pF) is inserted in parallel via T 2 is as shown in Figure 6 (C).
以上説明した回路を挿入することによりインピ
ーダンス整合がとれ、実用性のあるアンテナを得
ることができる。 By inserting the circuit described above, impedance matching can be achieved and a practical antenna can be obtained.
次に車体を接地板として構成するアンテナ２に
ついて説明する。このアンテナ２の構成は第７図
に示すごとくであり、全長51cmのエレメントの基
部から21cmの場所に２周波動作をさせるための
LC並列共振回路（コンデンサC3：4pF、コイル
L2：0.21μＨ）を挿入したものである。このアン
テナ２のインピーダンス特性は第８図に示すよう
になり、この図より明らかなようにVHFオール
バンドにわたつてインピーダンスが良く、実用性
のあるアンテナとなる。 Next, the antenna 2, which uses the vehicle body as a ground plate, will be explained. The configuration of this antenna 2 is as shown in Fig. 7, and it is located 21 cm from the base of the element with a total length of 51 cm for dual frequency operation.
LC parallel resonant circuit (capacitor C3 : 4pF, coil
L 2 :0.21 μH). The impedance characteristics of this antenna 2 are shown in FIG. 8, and as is clear from this figure, the antenna has good impedance over the entire VHF band, making it a practical antenna.
また、指向性については、車体を反射板として
構成するアンテナ３については第９図に示すよう
に単指向性となり、また車体を接地板として構成
するアンテナ２については第１０図に示すような
指向性となる。第１０図において、Ａ，ａは
VHFローバンドのときの指向性、Ｂ，ｂはVHF
ハイバンドのときの指向性である。 Regarding directivity, antenna 3, which uses the vehicle body as a reflector, has unidirectionality as shown in Figure 9, and antenna 2, which uses the vehicle body as a ground plate, has unidirectionality as shown in Figure 10. It becomes sex. In Figure 10, A and a are
Directivity when VHF low band, B, b is VHF
This is the directivity at high band.
以上の結果より、VHFローバンドについては
車体を接地板として構成するアンテナ２のみ動作
する２基スペースダイバシテイシステムとなり、
またVHFハイバンドについては車体を接地板と
して構成するアンテナと、車体を反射板として構
成するアンテナが両方とも動作する４基スペース
ダイバシテイシステムとなる。 From the above results, for VHF low band, a two-unit space diversity system in which only antenna 2, which uses the vehicle body as a grounding plate, operates.
In addition, for the VHF high band, there will be a four-unit space diversity system in which both antennas operate, with the vehicle body serving as a ground plate and the vehicle body serving as a reflector.
以上のように本発明によれば、単に第１、第２
のアンテナを一組車体上に設けるものに比べ、第
１、第２のアンテナを１組ずつ、車体の屋根の左
右に設けるとともに、インピーダンス整合回路を
備えることにより、テレビジヨンの広帯域化をは
かり、自動車が電波到来方向に対していかなる方
向に位置しても、自動車テレビのゴースト、フラ
ツター現象を軽減することができ、自動車塔載テ
レビ用受信アンテナとして実用上極めて効果の高
いものである。 As described above, according to the present invention, simply the first and second
Compared to the case where one set of antennas is installed on the car body, the first and second antennas are installed on the left and right sides of the car roof, and an impedance matching circuit is provided, thereby achieving a wider television band. Regardless of the direction in which the vehicle is located with respect to the direction in which radio waves arrive, the ghost and flutter phenomena of the vehicle television can be reduced, making this antenna highly effective in practice as a vehicle tower-mounted television receiving antenna.
第１図、第２図は本発明の一実施例における自
動車塔載テレビ用受信アンテナ装置の概要を説明
するための概略構成を示す図、第３図は不平衡給
電型アンテナ、平衡給電型アンテナの指向性を示
す図、第４図は車体を反射板として構成したアン
テナのインピーダンス特性図、第５図は本発明に
おける平衡給電型アンテナの具体構成を示す図、
第６図は第５図のアンテナのインピーダンス特性
図、第７図は不平衡給電型アンテナの具体構成を
示す図、第８図は第７図のアンテナのインピーダ
ンス特性図、第９図は第５図のアンテナの指向性
を示す図、第１０図は第７図のアンテナの指向性
を示す図である。
１……アンテナ、２……傾斜型モノポールアン
テナ、３……単指向性アンテナ、４……自動車。
1 and 2 are diagrams showing a schematic configuration for explaining the outline of a car tower-mounted television receiving antenna device according to an embodiment of the present invention, and FIG. 3 shows an unbalanced feeding type antenna and a balanced feeding type antenna. FIG. 4 is an impedance characteristic diagram of an antenna configured with the vehicle body as a reflector, FIG. 5 is a diagram showing the specific configuration of the balanced feeding antenna according to the present invention,
Fig. 6 is an impedance characteristic diagram of the antenna in Fig. 5, Fig. 7 is a diagram showing the specific configuration of the unbalanced feeding type antenna, Fig. 8 is an impedance characteristic diagram of the antenna in Fig. 7, and Fig. 9 is a diagram showing the impedance characteristic of the antenna in Fig. 5. FIG. 10 is a diagram showing the directivity of the antenna shown in FIG. 7. FIG. 1... Antenna, 2... Inclined monopole antenna, 3... Unidirectional antenna, 4... Automobile.
Claims (1)
として構成されるとともに、VHFハイバンドに
おいてのみ動作するインピーダンス整合回路を有
する第１のアンテナと、エレメントの途中にイン
ピーダンス整合回路を有し、かつ、VHFオール
バンドに動作するとともに、車体を接地板として
構成された第２のアンテナとを備え、第１及び第
２のアンテナが同一筐体に取り付けられたもの
を、自動車の車体の屋根の左右にそれぞれ設ける
とともに、、VHFローバンドについてはそれぞれ
の第２のアンテナを動作させて２基スペースダイ
バシテイシステムを構成し、VHFハイバンドに
ついてはそれぞれの第１のアンテナと、第２のア
ンテナの両方を動作させて４基スペースダイバシ
テイシステムを構成するように４本のアンテナを
結合してなる自動車塔載テレビ用受信アンテナ装
置。1. A first antenna that is arranged close to and parallel to the vehicle body, is configured with the vehicle body as a reflector, and has an impedance matching circuit that operates only in the VHF high band, and has an impedance matching circuit in the middle of the element, and , which operates in all VHF bands and is equipped with a second antenna configured with the vehicle body as a grounding plate, and the first and second antennas are attached to the same housing. In addition, for the VHF low band, each second antenna is operated to form a two-unit space diversity system, and for the VHF high band, both the first antenna and the second antenna are operated. A receiving antenna device for a television mounted on a car tower, which is formed by combining four antennas so as to operate to form a four-unit space diversity system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6359380A JPS56160148A (en) | 1980-05-13 | 1980-05-13 | Receiving antenna device for car television |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6359380A JPS56160148A (en) | 1980-05-13 | 1980-05-13 | Receiving antenna device for car television |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS56160148A JPS56160148A (en) | 1981-12-09 |
| JPS6159563B2 true JPS6159563B2 (en) | 1986-12-17 |
Family
ID=13233714
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6359380A Granted JPS56160148A (en) | 1980-05-13 | 1980-05-13 | Receiving antenna device for car television |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS56160148A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0369675U (en) * | 1989-11-07 | 1991-07-11 | ||
| JPH0372672U (en) * | 1989-11-17 | 1991-07-23 |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6059647U (en) * | 1983-09-30 | 1985-04-25 | パイオニア株式会社 | mobile receiver |
| JPS61126802A (en) * | 1984-11-22 | 1986-06-14 | Dx Antenna Co Ltd | Antenna mounted on automobile |
| US8344959B2 (en) | 2009-04-30 | 2013-01-01 | Nokia Corporation | Multiprotocol antenna for wireless systems |
| US8610638B2 (en) | 2011-01-17 | 2013-12-17 | Nokia Corporation | FM transmission using a RFID/NFC coil antenna |
-
1980
- 1980-05-13 JP JP6359380A patent/JPS56160148A/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0369675U (en) * | 1989-11-07 | 1991-07-11 | ||
| JPH0372672U (en) * | 1989-11-17 | 1991-07-23 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS56160148A (en) | 1981-12-09 |
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